KR100458849B1 - Poly ethylene compound using for a drainpipe manufacture possible to adhere to each butts of the drainpipe and a dreinvpipe manufactured thereof - Google Patents

Abstract

The present invention relates to a functional polyethylene compound used in the manufacture of a sealed double wall pipe capable of butt fusion and a double wall pipe manufactured using the same. More specifically, 0.1 weight of a compatibilizer in 100 parts by weight of polyethylene resin at both ends of the double wall pipe. Clogged double wall to fill the functional polyethylene compound composed by mixing 10 parts by weight to 10 parts by weight, 0.05 to 5 parts by weight of crosslinking agent, 0.01 to 2 parts by weight of antioxidant and 0.01 to 2 parts by weight of lubricant, so as to be fitted when connecting the pipes. The present invention relates to a functional polyethylene compound used for the production of a pipe and a double wall pipe produced using the same. The present invention is to fill the functional polyethylene compound at both ends of the double wall pipe by using a device capable of rotating the double wall pipe and the clogging end forming apparatus including a cutting machine and the filling machine to prevent leakage phenomenon in the joint, Butt fusion is made possible to form sewer pipes resistant to external pressure such as soil and sand.

Description

POLY ETHYLENE COMPOUND USING FOR A DRAINPIPE MANUFACTURE POSSIBLE TO ADHERE TO EACH BUTTS OF THE DRAINPIPE AND A DREINVPIPE MANUFACTURED THEREOF}

The present invention relates to a functional polyethylene compound used in the manufacture of a sealed double wall pipe capable of butt fusion and a double wall pipe manufactured using the same. More specifically, 0.1 weight of a compatibilizer in 100 parts by weight of polyethylene resin at both ends of the double wall pipe. When the pipe is connected to the tube by filling functional ends of the polyethylene compound composed of 10 parts by weight to 10 parts by weight, 0.05 to 5 parts by weight of crosslinking agent, 0.01 to 2 parts by weight of antioxidant and 0.01 to 2 parts by weight of lubricant, The present invention relates to a functional polyethylene compound used in the manufacture of a blocked double wall pipe to prevent leakage and to form a sewer pipe resistant to external pressure such as earth and sand.

In general, a pipe used as a sewage pipe or rain pipe is very large in diameter and buried in the ground, so that pressure resistance and watertightness should be well manufactured. Therefore, in order to satisfy such conditions, a double wall tube having a structure in which a hollow part is formed at the end of the tube has been developed, and the double wall tube thus developed has been manufactured in various ways to improve its disadvantages.

Conventional double-walled tube is wound in the form of a coil so that a cylindrical long tube formed with a hollow portion is maintained in a drum-shaped mandrel, and the molten resin is supplied between the gaps to form an inner surface and an outer surface by a roller or the like. do. The double wall tube having such a structure is cut into a predetermined length and manufactured into a cylindrical tube.

However, the conventional double wall tube manufactured by the above-described method has grooves in which the outer circumferential surface is recessed in a spiral shape along the hollow part due to the difference in the degree of heat shrinkage during manufacture, and both end faces are formed inside the double wall tube. The hollow part to be formed is exposed so that a part of both edges remain in the form of a groove. Due to this reason, the double wall pipe is not easy to connect the pipe and the pipe by the hollow part formed therein, and also causes problems such as deformation or breakage of the pipe due to external pressure such as load during use. It became.

In other words, in the conventional double wall pipe, the coupling or joining method between sewage pipes is not limited due to the grooves formed on the outer surface and the grooves formed by exposing the hollow portions at both ends of the conventional double wall pipe, and the hollow portion is formed after the joint. There is a problem in that the outside of the recess is weakened the strength of the bonding site.

In more detail, in the prior art, the grooves formed at both end faces of the double wall tube were unable to be joined by the butt fusion, which is the most perfect connection method. In addition, when joining the electrofusion sheet by the hollow part formed along the circumferential surface, a difference in the degree to which the hollow part is formed is melted by heat is often caused, so that the outside of the hollow part formed tube is often recessed. It will be affected by the load.

In addition, in the heat shrink sheet bonding, it is difficult for the heat shrink sheet to be completely joined by external grooves recessed along the hollow part, and a passage is generated between the heat shrink sheet and the grooves formed in the outside, so that the sewage and rainwater infiltration are generated. Of course, a problem of weakening the degree of fusion occurs, and the sheet is frequently damaged due to the strength and hardness of the heat shrink sheet itself.

Therefore, the groove formed along the outer circumference of the double wall sewer pipe by the hollow portion and the groove formed at the edges of both ends cause many problems in the coupling of the double wall sewer pipe.

Problems caused by such drawbacks have a problem that can not confirm the watertightness at the time of construction because the watertight test of the connection is impossible during construction. In other words, even if the case where the watertightness is lower than the standard, it is not confirmed at the time of construction, so it is buried.

On the other hand, in order to solve such a problem, the triple wall structure of the tube has been developed, but the pipe having the triple wall structure as described above is complicated in the manufacturing process and requires a lot of production time. In addition, since the material required for production requires more than the conventional double walled pipe, it causes the cost increase, thereby weakening the competitiveness.

In addition, the pipe of the triple wall structure is not only inconvenient to install due to the increase in the weight of the tube, but also buried due to problems such as cracks due to environmental conditions such as pressure and temperature changes applied at the upper part during long-term use after being buried. Compared to the situation is not getting much higher effect.

In addition, the triple-walled tube has a void phenomenon in which the filling layer made of polyethylene (PE) material filled in the hollow part is not partially filled or is uniformly adhered to the inner wall of the hollow part by shrinkage during condensation. Since the phase separation phenomenon in which the inner wall of the hollow wall of the double wall pipe and the filler are separated is not achieved, defect rate is generated during the fusion welding.

Therefore, an object of the present invention for solving the above problems is to fill the hollow of the functional polyethylene compound in the hollow of the cut portion of the double wall pipe, to prevent the occurrence of voids appearing partially filled portion, double wall pipe and the filler material The present invention provides a functional polyethylene compound that prevents phase separation from the physiological group.

It is still another object of the present invention to provide a blocked double wall pipe that is configured to be filled by filling functional polyethylene compounds in a portion of both ends of the double wall pipe.

One feature of the present invention for achieving the above object is a filler filled in both ends of the double-walled tube 1 part by weight to 30 parts by weight of the polyethylene resin, 0.05 to 5 parts by weight of crosslinking agent, 0.01 ~ antioxidant 2 parts by weight and 0.01 to 2 parts by weight of a lubricant in a functional polyethylene compound. The polyethylene has a density of 0.907 to 0.097 g / cm 3, preferably 0.910 to 0.960 g, as measured by the ASTM D-1505 method. / Cm 3, and the melt flow index (190 ° C., 216 kg) measured by the ASTM D-1238 method is 0.01 to 50 g / 10 minutes, and preferably 0.1 to 50 g / 10 minutes.

Here, the compatibilizer is preferably used as one of the unsaturated carboxylic acid, acrylic acid, methacrylic acid, maleic anhydride, maleopimarinic acid, or tetrahydrophthalic anhydride, which is a polar monomer. It is preferable that it is (Dicumyl Peroxide).

Preferably, the functional polyethylene compound is mixed in a dry mixer (Hensel mixer) with temperature control, melt mixed in a twin screw extruder, cooled in a cooling water tank, and cut into pellets to facilitate secondary processing by a pelletizer. , Filling the pellets to the hollow portion of the double wall tube cut using a fusion machine.

Another feature of the present invention is a double-walled tube manufactured in the form of a profile having a hollow portion and formed in a cylindrical shape, 0.1 to 10 parts by weight of a compatibilizer and 100 parts by weight of polyethylene resin in a hollow formed at a predetermined length of the end of the double-walled tube. And a filler comprising 0.05 to 5 parts by weight of a crosslinking agent, 0.01 to 2 parts by weight of an antioxidant and 0.01 to 2 parts by weight of a lubricant to form a clogged end structure.

1A is a front sectional view schematically showing the overall structure of a clogging end forming apparatus for filling a functional compound according to the present invention at an end of a double wall pipe.

FIG. 1B is a front sectional view showing a state in which a filler, which is a component of the clogging end forming apparatus shown in FIG. 1A, is coupled to one end of the double wall pipe.

2A is a side cross-sectional view showing a state cut along the line "A-A".

FIG. 2B is a view showing a state in which the clogging end forming apparatus shown in FIG. 2A is opened by an opening / closing cylinder.

3A is a view showing the structure of a holder which is a component of the clogging end forming apparatus.

3B is a view showing a state in which the feet of the holder shown in FIG. 3A are folded.

FIG. 4A is a view showing an engaged state of a cutting machine that is a component of a clogging end forming apparatus. FIG.

It is a figure which shows the state which forms the groove along the edge of the edge of a double wall pipe | tube through the cutting machine shown in FIG. 4A.

5 is a cross-sectional view showing the structure of the filling jig as a component of the clogging end forming apparatus.

FIG. 6 is a cross-sectional view showing a double wall tube in which functional polyethylene compound is filled at both ends through the clogging end forming apparatus.

* Description of the main parts of the drawings *

100 ... clogging end forming device 110 ... body

111 ... Cover 112 ... Base

113 ... fixed foot 114 ... hinge

115 ... fixing member 116 ... opening and closing

117 ... Fixture 118 ... Clamp

119 ... Retention guide 120 ... Holder

121 ... Pulley 122 ... Drive

123 ... Base plate 124 ... Guide plate

125 ... Foot 130 ... Cutting Machine

131 ... end mill 132 ... support

140 ... Filling Machine 141 ... Filling Jig

142 ... Insertion groove 143 ... Injection port

144 ... filling gun 145 ... supply line

150 ... rotating cylinder 151 ... fixture

200 ... double wall pipe 201 ... hollow part

202 ... Filling section

Hereinafter will be described in more detail the technical spirit of the present invention for achieving the above object.

First, when the present invention is schematically described, grooves having a constant depth are formed along the edges of the ends through the apparatus constituted by the present invention described below at both ends of the double wall pipe manufactured in the same manner as the prior art. The functional compound manufactured according to the present invention described above is filled in the groove and molded to have a blockage structure at both ends of the double wall pipe, so that the construction of the pipe and the pipe to be able to be mutually related to the technology. Water leakage is prevented by blocking the hollow part of the pipe with polyethylene (PE) material or foamed resin, but plastic sewage pipe is made by extrusion molding using PVC or polyethylene as a main raw material, and the strength of the entire sewage pipe of the plastic material is also Weakness increases the risk of breakage, and durability decreases relatively. If the hollow part of the cut part of the middle wall pipe is filled with existing polyethylene (PE) material or foamed resin, the hollow part is cut even if the filling is possible due to poor compatibility with the cooled double wall pipe. There was a problem that the gap between the filling and the double wall pipe was impossible because the gap between the unfilled areas appeared, and the filling material and the double wall pipe were not uniformly bonded. In order to solve such a phenomenon, maleic anhydride is crosslinked in polyethylene resin, and a polar group is introduced into polyethylene resin to improve adhesion with a cooled double wall tube, and also improve melt flowability. Functional polyethylene compound to provide easy filling. The pound is a dry mixer in which temperature control is performed by mixing 100 parts by weight of polyethylene resin with 1 to 30 parts by weight of a compatibilizer, 0.05 to 5 parts by weight of crosslinking agent, 0.01 to 2 parts by weight of antioxidant, and 0.01 to 2 parts by weight of lubricant. A conventional polyethylene mixing equipment such as Henschel mixer, Kneader, Banbury mixer, single screw or twin screw extruder was used to melt and mix to provide a functional polyethylene compound. The barrel of the twin screw extruder ( The barrel) is 10 parts temperature control is possible, the temperature range was 140 ℃ to 220 ℃ screw rotation speed was adjusted from 200RPM to 230RPM. Strands passed through the die of the extruder were cooled in a cooling water tank, and cut into pellets for easy secondary processing by a pelletizer. These pellets are filled in the hollow portion of the cut of the double wall pipe by using the filling gun 144, which is a component of the clogging end forming apparatus. The functional polyethylene compound used in the present invention is formed on the end edge of the cooled double wall pipe. 1 to 30 parts by weight of a compatibilizer for improving adhesion with the formed groove is used based on 100 parts by weight of polyethylene. The compatibilizer is a mixture of polyethylene or polypropylene for the purpose of dispersibility after the introduction of a polar monomer in the polyolefin main chain (poly chain), wherein the polar monomer is unsaturated carboxylic acid or anhydride, for example Acrylic acid, methacrylic acid, maleic anhydride, maleopymarinic acid, tetrahydrophthalic anhydride, preferably maleic anhydride are used. The polyolefin compatibilizer is melted and kneaded in an extruder with a polar monomer and a polymerization initiator in an extruder, It can be prepared by the polyolefin melt reaction method for obtaining the copolymer and the solution polymerization method for dissolving the polar monomer, the polymerization initiator and the polyolefin in the presence of a suitable solvent to obtain a copolymer. Dicumyl Peroxide In the molding process of the functional polyethylene compound, an antioxidant is added to give a heat resistant antioxidant effect, and such an antioxidant may be used alone or in a 1: 1 mixture of a conventional amine antioxidant and a phosphorus antioxidant. The lubricant used to suppress the decomposition of polyethylene by friction during molding is used calcium stearate (Ca-St), zinc stearate (Zn-St) and mixtures thereof. The functional polyethylene compound As other additives, a pigment, for example, black powder including carbon black may be added. In this case, an average particle diameter of carbon black is 10 to 60 nm, and preferably 10 to 30 nm. If the average particle diameter of carbon black is less than 10 nm, the dispersibility is lowered. If the carbon black has an average particle diameter of more than 60 nm, the carbon black has a disadvantage of lowering compatibility and impact resistance when filling a double walled tube. Filling the hollow portion 201 at both ends of the double wall tube 200 by the molding apparatus 100, and thus filling the functional compound in the hollow portion 201 at both ends of the double wall tube 200. Clogging end forming apparatus 100 is composed of a body 110, the lid 111 and the base 112 is rotatably coupled by a hinge 114. More preferably, the fixing member 115 is coupled to a portion on which one side hinge 114 of the body 110 is mounted, and the fixing member 115 is coupled to the fixing member 117 at the upper portion of the cover 111. And the opening and closing cylinder 116 so that both sides are rotatable between the fastener 117 and the cover 111 may be configured to be rotated about the hinge 114 by the opening and closing cylinder 116 to be opened and closed. A plurality of clamps 118 are mounted along the inner circumferential surface of the body 110, and one side of the body 110 is provided with a pulley 121 by an axis as shown in FIGS. 1A and 1B. The holder 120 is mounted in a connected state. The holder 120 has a guide plate coupled to one side of the base plate 123 at one side and a plurality of feet 125 at the other side thereof. The plate 124 is coupled. One side of the body 110 is the same as that shown in Figure 4a The cutting machine 130 having the end mill 131 as described above is connected to the support 132, is connected to the rod of the rotating cylinder 150 rotatably mounted by the fixture 151 is configured to be rotatable at an angle . In addition, the cutting machine 130 is able to cut the end of the double wall pipe 200 to a predetermined depth by the fixing guide 119 installed on the inner side of the body 110. And, the cutting machine 130 is mounted In the end position of the body 110, a filling jig 141, a filling unit 140 including a cylinder 160 and a filling gun 144 is located. The filling jig 141 has an insertion groove at one side thereof. 142 is formed, at least one injection hole 143 is formed on one side of the insertion groove 142, the filling gun 144 is mounted to the injection hole 143, the cylinder 160 is a filling jig It is mounted on the other side of the 141 to operate the filler 140 before, after. The functional compound according to the present invention by the clogging end forming apparatus 100 having such a configuration is for By filling the hollow portion 201 of the double wall pipe (200).

First, the double wall pipe 200 manufactured through a conventional general process is mounted on the clamp 118 mounted on the base 112 of the body 110, and the cover 111 is closed by the opening / closing cylinder 116. The position is fixed by the clamp 118 mounted to the cover 111. Thereafter, the feet 125 of the holder 120 are opened by the operation of the driving device 122 to bite the double wall pipe 200.

Then, the end mill 131 of the cutting machine 130 is moved to the end position of the double wall pipe 200 by the operation of the rotary cylinder 150 to start cutting, the end mill 131 of the cutting machine 130 When cutting to a certain depth, the holder 120 holding the double wall pipe 200 by the operation of the drive motor (not shown) is rotated and the edge of the double wall pipe 200 by the cutting machine 130 Grooves of a certain depth are formed.

After the groove is formed on the end edge of the double wall pipe 200 as described above, the cutting machine 130 is retracted by the rotary cylinder 150, the cylinder 160 coupled with the filling machine 141 is operated to fill For jig 141 is fitted to the end of the double wall pipe (200). As such, when the insertion groove 142 of the filling jig 141 is fitted to the end of the double wall pipe 200, the filling liquid is injected into the injection hole 143 through the filling gun 144 to end the double wall pipe 200. Filled in the groove formed in the rim. By such an operation, the double wall pipe 200 forms a blockage structure at both ends.

Based on the above description, the results of comparing the performance of a pipe composed of a double wall according to the prior art with a pipe filled with functional polyethylene compound at both ends of the double wall pipe according to the present invention are as follows.

Pipe performance test results Filling material Presence or absence Watertight Test Results Separation of Filling Material Polyethylene U Water penetrated Detached Functional resin radish Maintain water tightness Not separated * Inspection method for the presence of voids After cutting the hollow tube filled section 10cm in length and 5cm in width, the interface between the hollow part and the filling part was taken with an electron microscope (SEM) to measure the presence of voids. At this time, the measuring magnification was 50 times and 100 times. * Inspection method of watertight test According to Clause 10.6 of KPS M 2009 (Korea Plastic Standard), a 50cm length tube was broken by external pressure and then the boundary between the hollow part and the filling part The inflow rate of water was measured.

According to ASTM D 3574 (TEST "F"), the cross section of the tube was cut to 2.54 cm in width and 15 cm in length, and then the interface between the hollow part and the charging part was tested at a tensile speed of 100 mm / min using a tensile strength tester (UTM). In this case, the presence of layer separation and the interfacial strength were measured. As shown in the above results, when the hollow part of the double walled tube was filled with the existing polyethylene resin, the voids not partially filled were generated, and the phase of the double walled tube and the filler material was observed. There was no separation and no water penetrating into the tube during the watertight test.

As described above, the present invention is a mixture of polyethylene, a compatibilizer, a crosslinking agent, an antioxidant and a lubricant in a helical hollow portion formed in the circumference along the circumference of the body at both end portions of a sewer pipe having a double wall pipe. By filling the functional polyethylene compound, there is an advantage that the fitting is possible. In addition, by such a connection, there is an effect of preventing a leakage phenomenon at the joint of the sewer pipe and forming a sewer pipe resistant to external pressure such as earth and sand.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Claims (9)

delete delete delete delete In the double-wall sewer pipe is formed of a cylindrical body in which a flow path is formed, and including a double wall pipe in which a hollow portion is formed spirally in the circumference of the body, The hollow part is filled with a functional polyethylene compound, wherein the functional polyethylene compound is 100 parts by weight of polyethylene resin 1 to 30 parts by weight of a compatibilizer, 0.05 to 5 parts by weight of crosslinking agent, 0.01 to 2 parts by weight of antioxidant, and lubricant 0.01 ~ 2 parts by weight of the composition comprising a mixture. The composition of claim 5, wherein the polyethylene has a density of 0.907 to 0.097 g / cm 3 and a melt flow index (190 ° C., 216 kg) of 0.01 to 50 g / 10 minutes. 6. The composition of claim 5, wherein the compatibilizer is one of an unsaturated carboxylic acid, acrylic acid, methacrylic acid, maleic anhydride, maleopimarinic acid, or tetrahydrophthalic anhydride as a polar monomer. 8. The composition according to any one of claims 5 to 7, wherein the composition is mixed in a dry mixer (Hensel mixer) that is temperature controlled, melt mixed in a twin screw extruder, cooled in a cooling water tank, and then, by a pelletizer. The composition is cut into pellets to facilitate processing is filled in the hollow portion of the double wall tube cut through the fusion machine. In the double-walled tube manufactured in the form of a profile having a hollow portion and molded into a cylindrical shape, 0.1 to 10 parts by weight of compatibilizer, 0.05 to 5 parts by weight of crosslinking agent, 0.01 to 2 parts by weight of antioxidant, and 0.01 to 2 parts by weight of lubricant A double wall pipe, characterized in that the filling filler composed by mixing to have a closed end structure.